My favourite movie Essay Example for Free

My favourite movie Essay List of Grand Theft Auto Vice City Cheat Codes (PC) Weapon/Health Vice City cheats aspirine Max health canttakeitanymore Suicide thugstools Thug Weapons professionaltools Professional weapons nuttertools Heavy weapons preciousprotection Full armor youwonttakemealive Increase wanted level leavemealone Decrease wanted level Ads Anger Management in HDTataSky.com/Buy-NowBuy Tata Sky+ HD Never Miss The Latest Episode of Anger Management Download Gta Vice CityPlayOnlineGames.Inbox.comFast Access To 1,000s Of Games. Free, High Quality Flash Favorites! Gaadi.com No.1 Car Sitewww. gaadi.comIndias Leading Auto Portal. Review, Buy, Sell Your Car Now! Vehicle Vice City Cheats bigbang Destroy all cars wheelsareallineed Strip cars comeflywithme Flying dodo car greenlight All traffic lights are green miamitraffic Traffic moves faster travelinstyle Flying car panzer Spawn a tank thelastride Spawn a hearse rockandrollcar Spawn a limo rubbishcar Spawn a garbage truck gettherefast Spawn a sabre turbo betterthanwalking Spwan a caddy gettherequickly Fast car getthereveryfastindeed Faster car getthereamazinglyfast Fastest car iwantitpaintedblack Black traffic seaways Cars float on water gripiseverything Improved car handling ahairdresserscar Pink cars loadsoflittlethings Change wheel size General Game Play/Character Vice City Cheats apleasantday Nice weather alovelyday Great weather abitdrieg Cloudy weather catsanddogs Rain cantseeathing Fog lifeispassingmeby Speed up game stilllikedressingup Change pedestrian clothes fightfightfight Pedestrian riot nobodylikesme Pedestrians attack you ourgodgivenrighttobeararms Pedestrians have weapons onspeed Walk faster booooooring Walk Slower chickswithguns Bikini women with guns chasestat See wanted stats fannymagnet Tommy groupies certaindeath Tommy starts smoking deepfriedmarsbars Tommy is fatter programmer Tommy has thing arms and legs hopingirl Pedestrians get in your car cheatshavebeencracked Play as Ricardo Diaz looklikelance Play as Lance Vance mysonisalawyer Play as Ken Rosenberg looklikehilary Play as Hilary King rockandrollman Play as Love Fist character (Jezz Torent) weloveourdick Play as Love Fist character (Dick) onearmedbandit Play as Phil Cassidy idonthavethemoneysonny Play as Sonny Forelli foxylittlething Play as Mercedes http://menujupejwan.blogspot.in/2013/05/nfl-pro-2013-v149-apk-data.html

Critical Thinking Case Study Essay Example for Free

Critical Thinking Case Study Essay Describe all assumptions you see in any documents. Kelly Thomas Senior Engineer, Product Development1. Assumed AcuScans customers would not be happy with just anything developed and launched. 2. Assumed Pat did not have any technology experience previous job in the cereal industry. 3. Assumed Pat was talking to the programmers without Kellys knowledge or consent. 4. Assumed Pat wanted to continue arguing on email. Pat Lambert Director of Marketing1. Assumed the customer would be happy with anything launched on the market from AcuScan2. Assumed programmers could work in the new launch. 3. Assumed a new product launch would be simple to achieve. 4. Assumed that Kelly Thomas would go along with her regarding the Operation Optimize5. Assumed that the Operation Optimize could be launched in 6-months6. Assumed that meeting with Kelly Thomas in person would rectify the situation. Cliff OConnor CEO1. Assumed Pats work ethic and experience in previous job will automatically benefit the firm and reach AcuScans target market. 2. Assumed the staff would not have any communication or personnel issues. 3. Assumed there would be a budget crisis. Chris Martinas VP, Product Development1. Assumed that it would not take much time to produce and launch a new product. 2. The potential return for first year would outlay with substantial ROI. THE CONFLICT2) Explain the arguments made by each of these people. Kelly Thomas argued that the new product features could not be developed just like that and was detailed with planning, testing and quality control and could long make the features completely work by August. Kelly also stated that since the layoff two years ago, and 25% fewer programmers, they do not have the time or manpower for the product successfully to launch in time. Pat Lambert argued that Retail is the answer instead of airports and store security for the new iScanner product to enable retailers to identify incoming customers, with several high-tech features can be developed as a prototype by August and at one point Kelly admitted to it not being a problem to make the iScanner market-ready in time. Chris Martinas argued that Secur-A was, AcuScans competition was working on a new product so AcuScan needs to expand into a different market and launch a new product by early 2004 or Secur-A would be on the top of the market. Cliff OConnor argued that even though AcuScan was facing budget dilemmas they can find a way to launch the new iScanner. 3) Evaluate each argument. a. Kelly Thomas Kellys argument was logical mostly due to the fact he used the numbers and man hours from the first iScanner launch and he did not want to jeporize his and AcuScans reputation by throwing together a flimsy product launch. b. Pat Lambert Pats idea on launching a new product in a new market was a positive one, in fact, a great marketing strategy to be the first company on the market with a new product to get ahead of competition. c. Chris Martinas Chris does realize that to gain and maintain their  targeted market, a budget deficit would need to be put in action because he believes it is important to have a product launch in a new market. d. Cliff OConnor Although Cliffs argument deems logical, it becomes unbeknownst there are major budgetary issues with AcuScan and to launch the iScanner correctly, there are many other decisions that need to be involved, this may include more lay-offs. Cliff is basing the fact that this new launch in a new market will take minimal cost in time and money because AcuScan has done it in the past. 4) Describe specific fallacious arguments, and identify the people who hold them. Pat had a fallacious argument by stating that since other staff members had been with the company longer than Pat, they had a great deal invested in the company and knew what they had to accomplish in order to get a new product off and running. Chris made a fallacious argument about the company being on top again if the company developed a new product. But the since it is unknown, there is no evidence or research at this point the company cannot be certain of this fact. II: CONCLUSIONS1. Describe all problems in this situation. 2. For each problem, describe the data, arguments, and reasoning that contribute to each problem. AcuScan was faced with many problems trying to produce and launch their new iScanner. One main issue was the fact of AcuScan was planning to develop a new product when the company was already facing budgeting issues. Another problem was the staff at AcuScan not meeting face-to-face; instead they relied mainly on email to correspond with one another. Brainstorming, marketing product launches, and budgeting meetings could have benefited the staff and issues could have been handled different and resolved. Cliff, the  CEO should have taken initiative and interjected about the major communication issue the staff was having with one another. Use your reasoning to complete the worksheet below. 3. What is the underlying problem that is the base cause of the conflict within the company?The underlying problem that caused the majority of the issues at AcuScan was the lack of communication between department staff members which resulted in fallacious emails, snide, unnecessary comments which led to lack of production. 4. Alternative solutions. Due to the budgetary issues that were upon AcuScan, instead of a complicated new product launch, expanding the iScanner into industries such as hospitals, colleges and even government offices instead of expanding the new iScanner into the retail environment where the complicated launch requires many additional features is a possible solution, while keeping the idea for the retail industry on the shelf for future product launches. 6. Which solution will you recommend to the CEO? Why? Since both solutions are important, I would mention both to the CEO. Since communication is the backbone of an organization, I would bring up that issue first. Part II: Executive Summary1. Purpose and ScopeThe purpose of this summary is to analyze the issues on launching the new iScanner from AcuScan and rectify any facts pertaining to the potential launch. The scope includes various communications between colleagues and issues that resulted from that dialog. In conclusion the problems will be stated, solutions formulated and recommended results to rectify these problems will be discussed. 2. Summary of the SituationThe conflict between several key persons at AcuScan is hindering the growth of the firm and is causing havoc in receiving positive results for this potential new product launch. Secur-A, AcuScans, main competitor is only 4 months from launching their new product so it is believed to be absolutely essential to the survival of AcuScan to  beat them to market with a successful product as well. 3. Key PointsPat Lambert the new director of Marketing, and Kelly Thomas chief of the software development team, cannot agree on the length of time and the number of programming hours it will take to bring the new product to market. Kelly states that even with current staffing levels, they do not have the time or manpower to launch a new product the correct way. Pats states that a prototype can be built within the timeframe and budget however, neither Pat nor Kelly can compromise. Chris Martinas VP of Product Development believes that Pat and Kelly can work out their differences together. Chris does not quite understand the magnitude of programming involved with this launch though. ConclusionsAs a result of fallacious emails to one another regarding the new product launch for Pat Lambert and Kelly Thomas both feel alienated and find it hard to compromise on the new iScanner Retail Project. The fallacious emails between Kelly and Pat are regarding their disagreement about the capabilities of the software design team and the man-power to create programming for all the features in the new iScanner. Pat is not quite experienced in dealing with software programmers, their processes and requirements. Pat and Kellys emails result in emotional and defensive and inability to listen to each other and cooperate on the new iScanner launch so it does not happen. Conclusion and RecommendationsIn many cases, conflict in the workplace just seems to be a fact of life. Many have seen situations where different people with different goals and needs have come into conflict. And we have all seen the often-intense personal animosity that can result. The fact that conflict exists, however, is not necessarily a bad thing: As long as it is resolved effectively, it can lead to personal and professional growth. In many cases, effective conflict resolution skills can make the difference between positive and negative outcomes. The good news is that by resolving conflict successfully, you can solve many of the problems that it has brought to the surface, in addition to getting benefits that you might not at first expect:My recommendation would be to get Pat, Kelly, Chris and Cliff into a room for a face-to-face meeting. The point of this is to increase the understanding which is needed to resolve conflict and it expands peoples awareness of the situation, giving them an insight into how they can achieve their own goals without undermining those of other people. Additionally, if is resolved effectively, team members can develop stronger mutual respect, and a renewed faith in their ability to work together; and after allowing a brief period of venting, the meeting can be called to order. At this point I would recommend that all emotion be excluded from the communication process, so that the first of many beneficial and productive brainstorming sessions can begin. Another thing I would recommend is to re-vamp the iScanner launch so the product launch is conducive to the budget and to better fit the companys abilities. For instance, instead of launching a complicated product, possibly expand the current iScanner into other industries such as hospitals, colleges and the government, while adding possibly one or two features. The iScanner retinal scanner will perform the same functions as its current version with possibly one or two new features to keep within the companys budget. Keeping the expansion of the Retail iScanner idea on the backburner to launch in a year or two but after Secur-A launches their product. Reference Apollo Group (2003). UOP Assessment. Retrieved 4/19/08, from https://mycampus.phoenix.edu

Mathematical description of OFDM

Mathematical description of OFDM When we talk about the Mathematical description of OFDM then we cannot neglect the following mathematical treatments: The Fourier transform The use of the Fast Fourier Transform in OFDM The guard interval and its implementation As we have discussed above that a large number of narrowband carriers which are spaced close to each other in frequency domain are transmitted by OFDM. The modern digital technique that is used in the OFDM is FFT i-e Fast Fourier transform (FFT) and due to the use of FFT it reduces the number of modulators and demodulators both at the receiver and transmitter side. Fig. 4 Examples of OFDM spectrum (a) a single subchannel, (b) 5 carriers At the central frequency of each subchannel, there is no crosstalk from other subchannels. Mathematically, each carrier can be described as a complex wave: (1) sc(t) = the real part of original signal. Ac(t) = the Amplitude f c(t) = Phase of carrier (t)= symbol duration period Ac(t) and f c(t) use to fluctuate on symbol by symbol basis. Parameter values are constant over (t). As we know that OFDM posses many carriers. So the complex signals ss(t) is represented as: (2) where This is of course a continuous signal. If we consider the waveforms of each component of the signal over one symbol period, then the variables Ac(t) and f c(t) take on fixed values, which depend on the frequency of that particular carrier, and so can be rewritten: If the signal is sampled using a sampling frequency of 1/T, then the resulting signal is represented by: (3) At this point, we have restricted the time over which we analyse the signal to N samples. It is convenient to sample over the period of one data symbol. Thus we have a relationship: t =NT If we now simplify eqn. 3, without a loss of generality by letting w 0=0, then the signal becomes: (4) Now Eq. 4 can be compared with the general form of the inverse Fourier transform: (5) In eq. 4, the function is no more than a definition of the signal in the sampled frequency domain, and s(kT) is the time domain representation. Eqns. 4 and 5 are equivalent if: (6) This is the same condition that was required for orthogonality (see Importance of orthogonality). Thus, one consequence of maintaining orthogonality is that the OFDM signal can be defined by using Fourier transform procedures. The Fourier transform Fourier transform actually relate events in time domain to events in frequency domain. There are different version of FFT which are used according to requirement of different sort of work The conventional transform provide the relation of continuous signals. Note that Continuous signals are not limited in both time and frequency domain. Though, it is better to sample the signal so that the signal processing becomes simpler. But it lead to an aliasing when we sample the signals with infinite spectrum and the processing of signals which are not time limited can lead to another problem that is referred to as space storage. DFT (discrete Fourier transforms) is use to overcome the above problem of signal processing. The original definition of DFT reveals that the time waves have to repeat frequently and similarly frequency spectrum repeat frequently in frequency domain. Basically in DFT the signals can be sampled in time domain as well as in frequency domain. The Fourier transform is the process in which the signal represented in the time domain transformed in frequency domain, while the reverse process uses IFT which is the inverse Fourier transform. The use of the Fast Fourier Transform in OFDM The main reason that the OFDM technique has taken a long time to become a prominence has been practical. It has been difficult to generate such a signal, and even harder to receive and demodulate the signal. The hardware solution, which makes use of multiple modulators and demodulators, was somewhat impractical for use in the civil systems. The ability to define the signal in the frequency domain, in software on VLSI processors, and to generate the signal using the inverse Fourier transform is the key to its current popularity. The use of the reverse process in the receiver is essential if cheap and reliable receivers are to be readily available. Although the original proposals were made a long time ago [Weinstein and Ebert], it has taken some time for technology to catch up. At the transmitter, the signal is defined in the frequency domain. It is a sampled digital signal, and it is defined such that the discrete Fourier spectrum exists only at discrete frequencies. Each OFDM carrier corresponds to one element of this discrete Fourier spectrum. The amplitudes and phases of the carriers depend on the data to be transmitted. The data transitions are synchronised at the carriers, and can be processed together, symbol by symbol (Fig. 5). Fig. 5 Block diagram of an OFDM system using FFT, pilot PN sequence and a guard bit insertion [Zou and Wu] The definition of the (N-point) discrete Fourier transform (DFT) is: (DFT) (7) and the (N-point) inverse discrete Fourier transform (IDFT): (IDFT) (8) A natural consequence of this method is that it allows us to generate carriers that are orthogonal. The members of an orthogonal set are linearly independent. Consider a data sequence (d0, d1, d2, †¦, dN-1), where each dn is a complex number dn=an+jbn. (an, bn= ± 1 for QPSK, an, bn= ± 1,  ± 3 for 16QAM, †¦ ) k=0,1,2, †¦, N-1 (9) where fn=n/(ND T), tk=kD t and D t is an arbitrarily chosen symbol duration of the serial data sequence dn. The real part of the vector D has components k=0,1,..,N-1 (10) If these components are applied to a low-pass filter at time intervals D t, a signal is obtained that closely approximates the frequency division multiplexed signal (11) Fig. 5 illustrates the process of a typical FFT-based OFDM system. The incoming serial data is first converted form serial to parallel and grouped into x bits each to form a complex number. The number x determines the signal constellation of the corresponding subcarrier, such as 16 QAM or 32QAM. The complex numbers are modulated in a baseband fashion by the inverse FFT (IFFT) and converted back to serial data for transmission. A guard interval is inserted between symbols to avoid intersymbol interference (ISI) caused by multipath distortion. The discrete symbols are converted to analog and low-pass filtered for RF upconversion. The receiver performs the inverse process of the transmitter. One-tap equalizer is used to correct channel distortion. The tap-coefficients of the filter are calculated based on the channel information. Fig. 6 Example of the power spectral density of the OFDM signal with a guard interval D = TS/4 (number of carriers N=32) [Alard and Lassalle] Fig 4a shows the spectrum of an OFDM subchannel and Fig. 4b and Fig. 6 present composite OFDM spectrum. By carefully selecting the carrier spacing, the OFDM signal spectrum can be made flat and the orthogonality among the subchannels can be guaranteed. The guard interval and its implementation The orthogonality of subchannels in OFDM can be maintained and individual subchannels can be completely separated by the FFT at the receiver when there are no intersymbol interference (ISI) and intercarrier interference (ICI) introduced by transmission channel distortion. In practice these conditions can not be obtained. Since the spectra of an OFDM signal is not strictly band limited (sinc(f) function), linear distortion such as multipath cause each subchannel to spread energy into the adjacent channels and consequently cause ISI. A simple solution is to increase symbol duration or the number of carriers so that distortion becomes insignificant. However, this method may be difficult to implement in terms of carrier stability, Doppler shift, FFT size and latency. Fig. 7 The effect on the timing tolerance of adding a guard interval. With a guard interval included in the signal, the tolerance on timing the samples is considerably more relaxed. Fig. 8 Example of the guard interval. Each symbol is made up of two parts. The whole signal is contained in the active symbol (shown highlighted for the symbol M) The last part of which (shown in bold) is also repeated at the start of the symbol and is called the guard interval One way to prevent ISI is to create a cyclically extended guard interval (Fig. 7, 8), where each OFDM symbol is preceded by a periodic extension of the signal itself. The total symbol duration is Ttotal=Tg+T, where Tg is the guard interval and T is the useful symbol duration. When the guard interval is longer than the channel impulse response (Fig. 3), or the multipath delay, the ISI can be eliminated. However, the ICI, or in-band fading, still exists. The ratio of the guard interval to useful symbol duration is application-dependent. Since the insertion of guard interval will reduce data throughput, Tg is usually less than T/4. The reasons to use a cyclic prefix for the guard interval are: to maintain the receiver carrier synchronization ; some signals instead of a long silence must always be transmitted; cyclic convolution can still be applied between the OFDM signal and the channel response to model the transmission system. http://www.wirelesscommunication.nl/reference/chaptr05/ofdm/ofdmqual.htm Multipath Challenges In an OFDM-based WLAN architecture, as well as many other wireless systems, multipath distortion is a key challenge. This distortion occurs at a receiver when objects in the environment reflect a part of the transmitted signal energy. Figure 2 illustrates one such multipath scenario from a WLAN environment. Figure 2: Multipath reflections, such as those shown here, create ISI problems in OFDM receiver designs. Click here for larger version of Figure 1b Multipath reflected signals arrive at the receiver with different amplitudes, different phases, and different time delays. Depending on the relative phase change between reflected paths, individual frequency components will add constructively and destructively. Consequently, a filter representing the multipath channel shapes the frequency domain of the received signal. In other words, the receiver may see some frequencies in the transmitted signal that are attenuated and others that have a relative gain. In the time domain, the receiver sees multiple copies of the signal with different time delays. The time difference between two paths often means that different symbols will overlap or smear into each other and create inter-symbol interference (ISI). Thus, designers building WLAN architectures must deal with distortion in the demodulator. Recall that OFDM relies on multiple narrowband subcarriers. In multipath environments, the subcarriers located at frequencies attenuated by multipath will be received with lower signal strength. The lower signal strength leads to an increased error rate for the bits transmitted on these weakened subcarriers. Fortunately for most multipath environments, this only affects a small number of subcarriers and therefore only increases the error rate on a portion of the transmitted data stream. Furthermore, the robustness of OFDM in multipath can be dramatically improved with interleaving and error correction coding. Lets look at error correction and interleaving in more detail. Error Correction and Interleaving Error correcting coding builds redundancy into the transmitted data stream. This redundancy allows bits that are in error or even missing to be corrected. The simplest example would be to simply repeat the information bits. This is known as a repetition code and, while the repetition code is simple in structure, more sophisticated forms of redundancy are typically used since they can achieve a higher level of error correction. For OFDM, error correction coding means that a portion of each information bit is carried on a number of subcarriers; thus, if any of these subcarriers has been weakened, the information bit can still arrive intact. Interleaving is the other mechanism used in OFDM system to combat the increased error rate on the weakened subcarriers. Interleaving is a deterministic process that changes the order of transmitted bits. For OFDM systems, this means that bits that were adjacent in time are transmitted on subcarriers that are spaced out in frequency. Thus errors generated on weakened subcarriers are spread out in time, i.e. a few long bursts of errors are converted into many short bursts. Error correcting codes then correct the resulting short bursts of errors. OR for guard interval Handling ISI The time-domain counter part of the multipath is the ISI or smearing of one symbol into the next. OFDM gracefully handles this type of multipath distortion by adding a guard interval to each symbol. This guard interval is typically a cyclic or periodic extension of the basic OFDM symbol. In other words, it looks like the rest of the symbol, but conveys no new information. Since no new information is conveyed, the receiver can ignore the guard interval and still be able to separate and decode the subcarriers. When the guard interval is designed to be longer than any smearing due to the multipath channel, the receiver is able to eliminate ISI distortion by discarding the unneeded guard interval. Hence, ISI is removed with virtually no added receiver complexity. It is important to note that discarding the guard interval does have an impact on the noise performance since it reduces the amount of energy available at the receiver for channel symbol decoding. In addition, it reduces the data rate since no new information is contained in the added guard interval. Thus a good system design will make the guard interval as short as possible while maintaining sufficient multipath protection. Why dont single carrier systems also use a guard interval? Single carrier systems could remove ISI by adding a guard interval between each symbol. However, this has a much more severe impact on the data rate for single carrier systems than it does for OFDM. Since OFDM uses a bundle of narrowband subcarriers, it obtains high data rates with a relatively long symbol period because the frequency width of the subcarrier is inversely proportional to the symbol duration. Consequently, adding a short guard interval has little impact on the data rate. Single carrier systems with bandwidths equivalent to OFDM must use much shorter duration symbols. Hence adding a guard interval equal to the channel smearing has a much greater impact on data rate. http://www.commsdesign.com/design_corner/showArticle.jhtml?articleID=16504605 As we know that cyclic prefix is used to restore the orthogonality and preserve ISI, but the question that arises is that how the orthogonality destroyed between the subcarriers and how cyclic prefix restore the orthogonality. [1] [2] The orthogonality between subcarriers is destroyed due to the channel dispersion whenever the signal is transmitted over a channel and this cause ICI and due to the longer delay ISI occur among the OFDM symbols which are in sequence. [1] Further more there is no any interference in uncorrupted OFDM signal when they are demodulated but when we talk about the time dispersive channel the OFDM subcarriers lost there orthogonality. The main cause behind this is that the demodulator correlation interval for one path will overlap with the symbol boundary of a different path as show in the figure [ ] [ 2] Fig. 4.11 16QAM constellation We will see that this makes equalization in the receiver very simple. If multipath exceeds the CP, then constellation points in the modulation is distorted. As can be seen from Fig. 4.11, when multipath delay exceeds the CP, the subcarriers are not guaranteed to be orthogonal anymore, since modulation points may fall into anywhere in the respective contour. As delay spread gets more severe, the radius of the contour enlarges and crosses the other contours. Hence, this causes error. The CP is utilized in the guard period between successive blocks and constructed by the cyclic extension of the OFDM symbol over a period Ï„ : (4.3) The required criteria is that Ï„ is chosen bigger than channel length Ï„h so as not to experience an ISI. The CP requires more transmit energy and reduces the bit rate to (Nb/NT +Ï„ ), where b is the bits that a subcarrier can transmit. The CP converts a discrete time linear convolution into a discrete time circular convolution. Thus, transmitted data can be modeled as a circular convolution between the channel impulse response and the transmitted data block, which in the frequency domain is a pointwise multiplication of DFT samples. Then received signal becomes Where (4.5) Hence, kth subcarrier now has a channel component Hk, which is the fourier transform of h(t) at the frequency fk. The OFDM symbol is sampled (t = nT and fk = k/NT) in the receiver and demodulated with an FFT. Consequently, the received data has the following form yk = Hk xk, k = 0, . . . ,N −1. (4.6) The received actual data can be retrieved with N parallel one-tap equalizers. One-tap equalizer simply uses the estimated channel ( ˆHk) components and use it to retrieve estimated ˆ xk as follows (4.7) Also note that the spectrum of OFDM decays slowly. This causes spectrum leakage to neighboring bands. Pulse shaping is used to change the spectral shape by either commonly used raised cosine time window or passing through a filter. An OFDM system design considers setting the guard interval (Ï„ ) as well as the symbol time (T) and FFT size with respect to desired bit rate B and given tolerable delay spread. The guard interval is selected according to delay spread, and typically it is 2–4 times the root-mean-squared delay spread with respect to chosen coding and modulation. Symbol time is set with respect to guard time and it is desirable to select much larger than the guard time since the loss in SNR in the guard time is compensated. Symbol time as we know determines the subcarrier spacing ( fb = 1/T). Number of subcarriers N is found with respect to desired bit rate, since total number of bits (bT ) to carry in one symbol is found with B/(T +Ï„ ) and selected coding and modulation determines the number of bits (b) in one subcarrier. Hence, the number of subcarriers is N = bT /b. For instance, b is two for 16QAM with rate 1/2. The required bandwidth (W) is then N âˆâ€" fb. Alternatively, this method is reversed to find out the symbol time starting from the given bandwidth. OR Cyclic-prefix insertion As I m talking about the time dispersive channel I want to include that in time dispersive channel the subcarrier not only have inter symbol interference within them but they also posses interference between them. As we know that in case of time dispersive channel the frequency-selective channel frequency response is equivalent to time dispersion on the radio channel. There are two reasons of orthogonality between OFDM subcarriers. Due to frequency-domain separation. The specific frequency-domain structure of each subcarrier. Even if the frequency-domain channel is constant over a bandwidth corresponding to the main lobe of an OFDM subcarrier and only the subcarrier side lobes are corrupted due to the radio-channel frequency selectivity, the orthogonality between subcarriers will be lost with inter-subcarrier interference as a consequence. Due to the relatively large side lobes of each OFDM subcarrier, already a relatively limited amount of time dispersion or, equivalently, a relatively modest radio-channel frequency selectivity may cause non-negligible interference between subcarriers. Time dispersion and corresponding received-signal timing Figure 9 Time dispersion and corresponding received-signal timing. To deal with this problem and to make an OFDM signal truly insensitive to time dispersion on the radio channel, so-called cyclic-prefix insertion is typically used in case of OFDM transmission. As illustrated in Figure 10, cyclic-prefix insertion implies that the last part of the OFDM symbol is copied and inserted at the beginning of the OFDM symbol. Cyclic-prefix insertion thus increases the length of the OFDM symbol from Tu to Tu +TCP, where TCP is the length of the cyclic prefix, with a corresponding reduction in the OFDM symbol rate as a consequence. As illustrated in the lower part of Figure 10, if the correlation at the receiver side is still only carried out over a time interval Tu =1/∆f , subcarrier orthogonality will then be preserved also in case of a time-dispersive channel, as long as the span of the time dispersion is shorter than the cyclic-prefix length. Cyclic-prefix insertion Figure 10. Cyclic-prefix insertion Cyclic-prefix insertion is beneficial in the sense that it makes an OFDM signal insensitive to time dispersion as long as the span of the time dispersion does not exceed the length of the cyclic prefix. The drawback of cyclic-prefix insertion is that only a fraction Tu /( Tu +TCP) of the received signal power is actually utilized by the OFDM demodulator, implying a corresponding power loss in the demodulation. In addition to this power loss, cyclic-prefix insertion also implies a corresponding loss in terms of bandwidth as the OFDM symbol rate is reduced without a corresponding reduction in the overall signal bandwidth. One way to reduce the relative overhead due to cyclic-prefix insertion is to reduce the subcarrier spacing ∆f , with a corresponding increase in the symbol time Tu as a consequence. http://wirelesscafe.wordpress.com/2009/04/20/ofdm-as-downlink-transmission-scheme-for-lte/

The Masque Of Red Death :: essays research papers

The Masque Of Red Death. A virus had come. It killed all that it touched. No one could survive, the red death. Nothing had ever been like it. Sharp pain dizziness and bleeding at the pores where its signs. When prince Prospero's town was half dead he called on 'a thousand hale and light hearted friends among the knights and dames of his court." He called them into a castle. Guarded with a metal gate. They stayed there for 6 months, Eluding the 'red death." They had every thing they need there. Entertainment, food and all other things needed to survive. It was at the end of the 5th or 6th month that he called for a masked ball or 'of the most unusual magnificence." Abstract art filled the room with beauty. The masque was held in a suite with 7 rooms. The rooms were most curios with turns at every corner and gothic windows. The colors of each room varied. The 7th chamber was all black. The only thing different about this room was that the windows did not match with every thing else. The pains where blood red, there was no light of any kind. In there stood giant ebony clock 'whose pendulum swung with a dull heavy activities clang." All activities ceased with the sound of each hour. Everything stooped as if dead. ' But when the echoes had full ceased, a light laughter at once pervaded the assembly…..'; The first 6 rooms crowed unlike the 7th, until the clock struck midnight. Everything ceased like before until the last echo of the clock sounded. Many people became aware of the masked figure. 'There arose a length from the whole company." First surprise then horror to this figure. When the eyes of Prince Prospero saw him he did not know what to do.

Redemption in A Christmas Carol by Charles Dickens Essay -- Christmas

Redemption in A Christmas Carol by Charles Dickens Introduction Charles Dickens wrote A Christmas carol reflecting on the society that he live in the Victoria Era. During the reign of Queen Victoria Britain became one of the most Industrialised countries in European. From Britain Factories, mills, shipyards came products ranging from steam locomotives, to textiles and ship, while coal miners toiled deep below the ground to produce the coal needed to power Britain expanding Industries. During Victorian times there was a serious gap between the rich and poor. Rich people were very wealthy and poor people were living outside on the payments in very poor weathering conditions, also poor people were in poverty. Soon industrialisation began factories started to open, and poor people began to work in factories. Many peasants were paid minimum wages. So many peasants were suffering hardship for example living condition. Living condition during the Victorian Era were very poor they used to work for a long working hour and not get any break or time off at any Time. And Long working hour made poor workers very tired. They would get straight to work as soon as they enter in. Later child labour began. Many children started working in factories. Most of the children were mainly boys rather then grails. Child labour in Victorian England was described as the children chained belted harnessed like dog, and also half naked. Diseases were caught quite a lot during the Victorian times by children who were working in factories and other sorts of places. Charles dickens decided to call his story a song because Christmas was associated with celebrating and singing carols. Everything that’s he wanted to bring ... ... everyone he meets. He visits Fred's house and has a wonderful time at the party. The next morning, Scrooge gets to work early. When Cratchit comes in late, Scrooge pretends to reprimand him, then gives him a raise. Scrooge continues his kindly ways, befriending everyone and becoming a second father to Tiny Tim, who does not die. He never sees the ghosts again, but he keeps the spirit of Christmas alive in his heart as well as anyone. The Conclusion is that scrooge is a miserable miser who cares nothing for other and does not known how to keep Christmas. Consider the matter more carefully, these fire well fed business men certainly know how models of conspicuous consumption. Their charity would reach a handful of people who got out of it a good meal for a day and nothing would alleviate the sources of their poverty and misery for the rest of the years.

Homosexuality Essay -- Gay Lesbian Homosexual Essays

Homosexuality My frustration with debate about homosexuality stems not so much from the arguments themselves, but the actual method of argument. Often, two â€Å"experts† will approach the topic from two radically different â€Å"expert† fields. One may be a New Testament scholar and thus draws out the intricacies of Romans 1:18-28 and the true meaning of the word â€Å"homosexual offender† (i.e. older man sleeping with a young boy) in that case. The other may be a biologist who appeals to natural logic and reproduction to defend sex as a behavior meant for heterosexuals. Both of them are right within their own expertise. But they cannot, then, debate, for it would be like Chuck pitching to a batter on another baseball field. I was pleasantly surprised, then, when Via and Gagnon approached the issue of homosexuality from the same basis—the Bible. If indeed homosexuality is to be embraced (or rejected) by the Church as a legitimate expression of one’s being, then one cannot dismiss the Bible as only part of the argument. Behind almost every denominational tradition, the Bible stands as a primary source of wisdom/ethics/practice that, even if its inerrancy is being questioned more recently, cannot be discounted so easily. Approaches: Therefore, they both come to scripture as authoritative, though both also read it through a historical/cultural critics’ lens. Gagnon certainly takes the position that the Old Testament and New Testament commandments condemning homosexual practices are absolute, saying that a purely scientific renege of multiple biblical instructions is not enough. As scripture interprets scripture, he points out that Ezekiel, Jude, and other texts all support homosexualities’ blanket condemnation. Via seems m... ..., they should not act upon them in a sexual way, as they can be fully alive without sex. Some questions I still harbor: If homosexuality is something God has given humanity as a sign of God’s wrath (as Via implies) and not necessarily a sin, ought we still accept it? Can we take the Leviticus passage out of context and put it with the â€Å"impure† laws about menstruation when it actually rests between a verse about not sacrificing to idols (obviously against both OT and NT law) and having sex with animals? If we can, then we may make the case that beastiality was just an impurity law and is now a legitimate form of sexual expression. Should we make decisions in the Church based on what is best for the whole body in terms of acceptance and love of people (so that others may be more open to hearing the gospel message), even if it may be â€Å"wrong† according to scripture?

Company Profile Bigmak Essay

For every story of triumph and success there’s always a powerful belief: â€Å"To accomplish great things, one must not only dream,, but also act, not only plan but also believe† – There once a couple who have dreamt big and believed anything is possible, with one grinder and pieces of margarine cap used as pattern for making patties and with hard work and faith in God- the key ingredients of which lead us to this success story. In 1980, Mr. Francis Bulado Dy, a native from Mauban, Quezon after being married to Ms. Edna Beltran Aycardo had started their married life in the island of Burdeos, Quezon, the hometown of Ms. Edna Aycardo. Having a clichà © in business that runs through their blood, the couple had continue the established business of Ms. Edna Aycardo when she is still single the ENJ Merchandising. The business is basically into retailing and wholesaling business of food commodities, household needs, hardware which includes a small pharmacy, as Mrs. Edna Dy being a licensed pharmacist. In 1982, as an added business in the island and Mr. Francis Dy’s background to this field of the business, Pacific Copra Trading was formed. The copra dealership business has currently three (3) branches on Polilio, Mauban and Burdeos, Quezon. In 1984, having gifted with business acumen certainly had not stopped them from venturing into other business. When they transferred residence to Lucena City, Quezon for the education of their eldest son, Mark Francis Dy, they wanted to start another business venture in line with food. As currently a fad or food craze at that time, business relating to burgers and hotdogs sandwiches is what they wanted to go into business next. Mr. Francis  Dy likes to formulate his own products that would look more competitive and desirable to meticulous sandwich aficionados and will excel in taste. Firstly, he must create a good business name. The supposed company name must have a name recall that people can easily remember. He wanted the corporate name to be common and certainly related to the nature of business. As creative as he is, he was able to create an appropriate and eyecatching company name. The LC. BIG MAK BURGER was born. The name was derived from Mr. Francis DY’s parents name, Maxima And Kimsuy, and added the word BIG which connotes big buns and patties. To distinguish the origin or home of the business, which is in Lucena City, the word, L.C. was added. BURGER signifies the products being sold. On November 8, 1984, they established the very first van outlet located at Quezon Avenue corner Rizal Street in Lucena City. The second van outlet was launched on February 17, 1985, which was positioned at Quezon Avenue corner MS Enverga Street, 400 meters away from the first van. LC Big Mak Burger then chained to Gumaca, Batangas and as far as Bicol region. There is a need to have some changes and improvement on the production and the company started to hire food consultants and technologists to make sure that the taste suits the customers. It was successful, as sales have doubled. On March 18, 1988, after more or less four (4) years of hardship and sacrifices came the inauguration and blessing of a newly constructed Big Mak U-shaped building. This building became the new office and production area. At this time, the LC Big Mak Burger, Inc. had thirty (30) outlets that served the public from Lucena City to San Pablo and other various towns of Quezon, Batangas, Laguna and and eventually had gone up to more than 100 outlets in Calabarzon areas. Starting the year 1988 and for the succeeding next five (5) years, LC Big Mak Burger, Inc. ventured into more branches in Metro Manila and nearby towns of Cavite, Rizal and Bulacan. Neopolitan areas covered more than 50 outlets. Going to the North up to Tarlac, La Union and Ilocos. Expansion has widespread that it covered sideways of the eastern part of Luzon to Isabela and Cagayan. Total outlets established were more than 200 outlets. Within these five (5) years of operation, LC Big Mak Burger, Inc. has covered the entire Luzon. These expansion programs were brought rapidly by the profitable venture and increased sales. The company acquired properties in Tarlac, Isabela and in Quezon City, which housed the branch offices, bakeries and depots. Several food centers were also opened on these periods. During the same period, due to the continuing expansion coverage of area of operation, the demands for additional delivery and transport service was needed. The management created a trucking and motor pool service to support its operation, thus the MDL Trucking Services (which was named after their 3 children, Mark, Dave & Lei) was created. In 1995, Due to the continued volume sales and demand, the company required to put up a much bigger manufacturing plant that could produce higher volume quantity. The construction of the manufacturing plant started and the plant was named Southern Processing Corporation (SPC). It was inaugurated on February 18. 1996. The management acquired modern equipments, tools and other machineries which will make the production much faster and efficient so as to sustain our inflating product demand. Aside from the productions intended for L.C. Big Mak Burger, Inc. consumption, the plant also serves the public by creating a sales arm called the Southern Delights. It has wide varieties of meat products from siopao, siomai, lucban longganisa, ham, bacon, and different kinds of hotdogs, beef patties, tocino, corned beef, tapa and other cold cuts. LC Big Mak Burger, Inc. started to hire additional qualified staff mostly in 1995. This is in preparation for the expansion program that will be launched starting 1996. With the modern facilities of the plant, the company can now expand down to the Southern part of the Philippines – Visayas islands. Thus, in 1997 the company expands initially to Cebu City with 50 outlets, followed by the expansion at Tacloban City with another 50 outlets and lastly in Dumaguete City, Negros Oriental with another 50 outlets. The company acquired properties in Tacloban and Cebu. During the same period, they have  also created the BIGMAK Catering Services. As the demand grew and the couples fashion for food, service and untiring innovations they have decided to expand and start a new business, thus a banquet hall named Queen Margarette Court was established. It would cater and service the needs for events, functions, conventions, celebrations and other type of affairs not only to public demands but also its own conglomerate’s affairs. The Court got the public’s approval as shown by its fully booked listings. It had initially 3 big and 3 mini functions rooms with modern facilities and amenities. Likewise, a manpower agency was opened to primarily hire crews, staffs and personnel for the existing businesses. It was opened to serve the needs of the company and later served also the public as well. The demands were high that another two (2) companies were created, one is the Gain Manpower Services and another after which was created, the CARES. These are all manpower and placement agencies. As an added expansion, it was on 1999 Queen Margarette Hotel was inaugurated. It has 43 air conditioned suites and rooms with modern amenities such as pool, mini bar, Jacuzzi and other facilities of a modern hotel. It was tagged as the Best and the Finest in the Southern Tagalog region. Currently, there are a total of 65 rooms at the hotel or an addition of 12 luxurious rooms on the third floor. The fourth floor hosts four (4) additional function rooms which houses conference rooms for conventions and meetings, other functions and various hotel facilities & other services. Also in 2002, several businesses relating companies where built to make the mother business operates smoothly and to make other existing companies benefit from the facilities it offers. The Pacific Ocean Transport Corporation was inaugurated in February 18, 2002, as its two cargo lines MV Emerald and MV Little Mermaid are shipping to and from Polillo, Mauban & Burdeos transporting copra and other selling merchandises. It helped the existing Pacific Copra Trading and the ENJ Mega Store expand rapidly due to accessibility provided by the shipping business. From there on to the present, there were various developments and enormous progress that have had happened to the company. A lot of improvements were done. Currently, there  are 12 branch offices nationwide under company owned properties. On 2009, Southern Swine Paradise & Farm, Inc. was blessed and inaugurated. Its business is engaged on raising swine, hogs and other poultry and domestic animals for the purpose of supplying meat needs to local consumers. For more than two decades, LC. BIGMAK BURGERS INC. had been in the food service by providing the Filipino people with high quality, great-tasting and affordable products all over the country. It has over 800 outlets nationwide. It continuously grows as like the sandwich in infinite in number sold as it has been miraculously and continuously patronized by local consumers. The blessings of God are like showers from heaven that falls to the couple. They have been chosen by God to share these blessings to a lot of people. These blessings should be shared and not to be wasted to a haste. Let us all be thankful to HIM for all these graces. We can achieve our vision through: 1. BOUNDLESS TERRITORY – we intend to expand our business in areas which we think is viable to the company. We recognize no limits in boundaries. Our priority is to penetrate the whole Philippines and finally we can tap the global market. 2. EXCELLENT VALUE FOR CUSTOMERS – we view our customers as our most important corporate assets. They are the essence of our being in existence. They deserve only the best value we can give. A combination of quality product, reasonable price, convenient, fast and friendly service. We believe that creating value for our customers is the best way to create value for the corporation. By providing only the best for our customers, L.C. Big Mak Burger, Inc. is destined to be recognized as one of the leaders in the food chain industry. 3. SOCIAL ACCOUNTABILITY – L.C. Big Mak Burger, Inc. recognizes its responsibility to society. Its business, activities and policies are aligned with that of government institutions. It support government programs on nation building and economic progress. Likewise, L.C. Big Mak Burger, Inc. shares its blessings with the Filipino people through its community outreach program. 4. TOP QUALITY PEOPLE – L.C. Big Mak Burger, Inc. employs only the top quality people. There is no compromise for mediocrity. We regard our highly qualified employees as our most valuable resources. Without them, we will not be able to reach our objectives. In return we would like to make all employees feel secure in their jobs, to promote their total welfare and to ensure their growth both as a professional and as a person. We hope to achieve this by providing them with healthy working environment, professional organizational mechanism, as well as above average wage and benefits compensation packages.